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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bffc8a9a23148ca35ca3744a6a3085b1b6c287e53262c6769d11349d9538261c' 
  AND token = 'qahamu5Op1i7rMmzMfN+EfhxM6YAjJePQx8V4+6DuEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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