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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdf208b0e0950a628e389c08ded84c3c890274fa112d63faaf5195c562713f39' 
  AND token = '9GjZ3eJxdTAYA9OvRAnpMhDEpZtR71X0p49jIndSuyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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