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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bdecc0b0d43ad01a1ac1b9b1ddd884f17085eabd71b163778911fe1c9e06fc6c' 
  AND token = 'SavJpQ27fTQrw9VxKl2E83aOXPWTIVqku5AdaHsNUhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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