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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46f5c342bfaab4c0ee701bc7dfa3a99c0e0b6b43433e71acdc79ae6cfdb83a6d' 
  AND token = 'x3Qbswy92+HAzptvsKSyf0jRyMc2K7qq1PHBROfPTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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