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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77cc821cc101b8e9a7ebc7e65f7c73c07a7d9519aaea25445fc1e45a93192a9e' 
  AND token = 'NpNSqnT74pDmUFbyK+91Q9BxLfio5b9dijJNWHQ5AuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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