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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '069cd96dea85d02b0da6b8abdc4bb854490b41d8647fc15438072c449f8c63c5' 
  AND token = 'WTVUv1kIAvN6ez3UHuuI++quDCr0Na6f7t7erJ0lt4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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