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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '131ded13ee97e7c62eeaf425e99c3ff1aa622039c8258511ed0270b4e1fc20cc' 
  AND token = 'HZ9+GxSmWFMVSTCsmjA3VQ1WbJVS71EeV8uz7PsCM8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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