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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '784b8cbc0c16f73bf91323d1572b3c3ece0c580a754485318040113710f512da' 
  AND token = 'sScZH9XHPMRTdph2G8AyM2oDz/2lDEIOTKpn3e2fR8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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