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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5399d142302ae5a3f751ad03b31520db92cd884a162bae7c6f54742324382e4' 
  AND token = 'nHnyuoPkHAyJNs7cqdmcQhFKPehuMLvTS3deifvxO54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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