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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39b59c4a7cd9973be01e5a13013f089184a997c22dfe46cdf43ce26ab6c70231' 
  AND token = 'qutSBGdiXy+l6y3KCPoHI0POta1rtL6ZrRexndOV5Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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