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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c85f19a6e3326b0018324cda58efd57f96ba4466d8c60bbe0986ac96a68c3faf' 
  AND token = 'dfWVoumbZdzGyY4vEHKe52bwYcOexMa/mXsfgt3bgfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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