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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5e545e578554ab3e4bd99c84db26b1ebde4256607c46ae50d16f528d69e9eef' 
  AND token = 'OCD8W+6ozbCuLEkTNEir+fJD4YpFXOzORsmLn8+Cd1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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