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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '71a5461e94a257fc1d9160560ca35544ec516bdd3265d5bcdf172167974d4b38' 
  AND token = 'VvTS6UJSPDNcmnLcEXnBD1846DMGEq69zvmLx5Z1q0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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