SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82f61d05971a5d0c1a4d657839a034603fccd8c7d7537780a97ab7d594fadaf9' 
  AND token = 'iEQ2YCY4sQPLf5znDCV7XJya0KSy2Eb/w+vsY1T7BpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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