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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a9ac86707a0e9880b1accfbeb19904c6e7fdcd70d7918cb32002d0bb3799ca4' 
  AND token = '0bKUi9UTL2w46uiLcx7x2IL5Xw8vYaMr4cYTcU4I3fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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