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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f8dc2a9272e485b800e53d0f565b7f0a3edbde637c5def138ad964214406cd4' 
  AND token = 'Q2/5pDqGa1uliDhEjN38E7QOzEnvXQnH+OO1ZDW8ud4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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