Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8b9c519660fab3e4be399a47ea376167e3a312e75b7bd1ebcbe911b36a5bc4' 
  AND token = 'zGBMv1UYq9ow+3sneOBQ3/m5xytgcMuqnS9E8wN+G1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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