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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f44ba3061db348799cafa1f4db4b57ab5bd3335d18b2be5b2050fa85d5a94fa' 
  AND token = '8IR3clywWRJHBaFJwY7YEpNU8jcSgOnE8OG+rp9XUgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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