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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82cd3b528a9c188fdb25ef8ccfbbb4adb2ee104c42380af27f9ba8256f6926c8' 
  AND token = '3zs1pAaqSkV5sJgHV8W5jKwMrAlC+UiyEyUEVAkejFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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