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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '065cb75cdafb546267d99670b676d6f868b5f5b8482f9c945c384ded83d3f8a2' 
  AND token = 'p+Y49zZ8hRC1CjuRBAa1nA50jM2++WpgzCad6wfp8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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