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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '398a93a1502cde6719cf9a714a8286f584109503494501a95fae01cb11b2fd57' 
  AND token = 'j2fRkyLKx2Q5SjW3lily8Qn0E3x+QESKE0kWUvyKFe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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