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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '477c55578ed385fb545683c243231626d02c52b108169bdab16580eee544e1b5' 
  AND token = 'Zb9wLMhX/jMoSz70anTIigjjw2D4AeaUwweUOj6R+CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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