Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36283a1241364fab539450ff6086713c82fb4213c27d572638ddbcead3f21aef' 
  AND token = 'ltquJZzEFTFl7Ep6ZK9ZGGy1ifHW6AoLy2x6knjscXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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