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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e037fdfc1fd00656d873bf0227569ecb0b8368f86843391bbcd9b5d86a771fd3' 
  AND token = 'MreGOynNsuu3u3GR5foDDOliteS1Uy45aFAhWK5YLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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