Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea38f0ed3a2bc5fdcf623bc9edb99484ca6cd2a069828aa49239a81dc6d2ef1c' 
  AND token = 'e38h1hxsG5ZfzU15wnjkAJPwySoVCzHMKgsqIhTJVew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}