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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'edc569628a2a290fc9170d89577d257ee235a7b42498ca0d29903768c8338ffa' 
  AND token = 'okldT6+VbgU+Icpz2mRbn8zGMn3nu0sWQvC+J/bNMDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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