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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef72338043d15b1ddec3c07d0b32d9b02a88ebb5eb16f80f1c0437aeb59e09e4' 
  AND token = 'IIniQ6fl9pKcRuUZpt6iVoPxFlJYHmdwDixMWuCa5fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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