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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58fd9d4c8d46791f1c89fff96ba1b7aa8539d1d7b07009b830a889032d163ee2' 
  AND token = 'QSSJ2M/G9RJPSzQao5ShOjbq9St7j5+BETr8y4G1bd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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