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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf6486b0fe326b57e8fc94b1f2d6d1c2022281d278d851c557b3c1357779bae5' 
  AND token = 'lXt1w8vQmZshKqrIOFSnWqvD7plUc8Do3wn6Vuh6NwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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