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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdbd2d99db400e466ca12a5ef78788214f7ada016331e635dccf8fbaa6787b1d' 
  AND token = 'Uu6uAh1fPkXbi1BCqYRpA7qFxqe9b3snomlImA1sCsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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