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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9916cd76c7ccc0c96d3d1a64f50a3a28c136fb4d5060a8f6ff35316b17dd8d56' 
  AND token = 'ojvnfZNfF2xrbmu2dNsemFAOaH1IssMsSPVKyqU4v04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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