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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5814f71b6fdcd5f2a7245bb84ebb264a183b3582aff8348acc9d14a51eb54647' 
  AND token = 'YaUja+UTlQZXdDb6Ic9ZI1NwunIhIYeI+yqc9UR8z+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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