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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ad639b1e23e3338974f30c4f04c57a3cf28358c1949b168d390d2793a101097' 
  AND token = 'Hu0Bdt0emDDmoEYD4c8fpGPd8JlqIGAmiW6Mw2MpgpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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