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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '288022a958c1df113ef4ee94bec0335b5b835b6e0166d121a53e01f8f26f9331' 
  AND token = 'ioYRfucRGPfqQTIFNPhqSNC9tf9+D/T7HC9idwlyTzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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