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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'db52b834448317fd91dc381f39257cd35baf80974f5e26e7ea81b4f519f13671' 
  AND token = 'xJXfcGBfRgMET0fVC+1CNCGN3l82MGhlLr+abDU2eLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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