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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ffd0dfb15ee793410c32b731815f34e4836d9837dec48346fb1ff650c8be51d8' 
  AND token = 'SWr7Ps7Kmih43vtctY+4xbNdJBOV5DkniAX5sKqfQ5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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