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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b5580e7df9fcc56ee19407c163924ab07a507044bf35245c209a858b6b8909f' 
  AND token = 'PF6yG6tHuo/Ud9sFQIlQNoCJ7uQfVlb4cOEJKOX8/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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