Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2efa505f6e4196007784356cee76ada095c2c42e0e6e9c32f20d18b78dfa1b' 
  AND token = '8yL+BCi3MI5oqBpNj20i4AkOlzehmIICWS2II1zp2/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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