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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '000ae02582fe03c4ea2bee20bf1638976f9551b71a6927a10b69acba4c77c29c' 
  AND token = 'mh5Awkwn3IHYbsmQ3hZXcflsiXuogF5xmP5RT2f3WZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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