Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46f5872b15fe38c73c7b151e983fc965042ea7e996729daafecfbaec70e9e51' 
  AND token = 'cF6OFGadypxAuuVPisqg8/F91se0BDIFsoTl+gdedPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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