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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e98b1817efbfb214e1aa80212e4f1ce5c638f9f98c44831ad858377ef6a0e0e' 
  AND token = 'DGgYfr+G+qjjEBxfWNCQpXQ2sFG+apKeNjsj8uMJY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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