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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b642a6ccb2626c9d406e7852428d7338ce64c5ac5cbe55dfc27aebd760437500' 
  AND token = 'FPcdBsnzs7sjz+0fHjEuwzlwmQNL6pLUb7UwAfbQH/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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