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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '101df1f71c5ba2c63f7a3c1da73fa3f1d2375a57a106193fe7ec7ea5ef67bfa8' 
  AND token = 'x5Xi+/VQVQGgFuvOijw2IaSx3uL5X4IRs1mLlIIFuK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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