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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '349851ec46da11d059e6ffe1625f0a4ab2a31fcdb77bbf15f4a5f135dd3906ad' 
  AND token = 'M2wGyppGkMdbrQPyK/+owa+O6e9INPWZRZ/YG1RHOCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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