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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd10ef104ca75011f66b9d7046abee174804e572ce6fb80cae084ba23e891be0d' 
  AND token = 'MZZ2mV/H5laqRy76EPA8OkxqxrQ/3HAp2ckSJjpxKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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