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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '03eb1663417143fe66753abe4e9857c5007fe5f55bff5a6c0b7f7c0e64d2060c' 
  AND token = '430hgjfNfPIfoiQplEiorGw3i25sk+uJv323eO/a0hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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