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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '413a5b9009fcfecc2eddae9b3a06a6142e68237a5878e23186083e16cf6a5fce' 
  AND token = 'lh84Cod3gcrqJ+jBmehRdA5sU3DNRLUbtSMc87ecFJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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