SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '265964bb82aa0db05a25e2d56533dd930b4a904468699552e869d4b4129c32f7' 
  AND token = 'R4qlwLH/ISOkqnvXmUGciZmtrYCL/BzssoeDaX+yroA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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