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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ded9f8a74e256314d629e9b1cf2299f0d34a1de5f91140d46b269375e977a895' 
  AND token = 'Ia0Lmn8YfuaIEvZQyuT/5IyDhk3QsCRdrIsLXmR8CBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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