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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e03b5f5a29c802dd1edfa42712ef7c8d8ceaa4cd7ce88c5f71d3a72802726ce' 
  AND token = 'npiSMbSQlt8f465QymvgufM+ToanNpRdTouI+HO6Cao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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