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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7b068eba25618c8875c4a8530bae2c44ebfc3355817abfdd15f0c71c7d783cf' 
  AND token = 'nKBn7Vrh0faj7kdiKEiuvCjFXTK6tVQhOrrigUFHff0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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