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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72c06c6977c3cd832a7c0a30f48195346525bdaee482dba4464b1453c7a6072c' 
  AND token = 'ZjUE8568vRQgAsH67DYxPf/237DMTQarEUyT2oQLBJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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