Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c178d94c4cbbdb4410c02c3d1e8b0678ba16d51ad09f3dee846699a954cac76' 
  AND token = 'iovm32hsZtph7V2qPorzRzbrhDoajUIL/sAUkiwF/fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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