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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b544728d94f49e77dbb27f186bd6680aac6d1d777a171705d7227bb8262d612b' 
  AND token = 'PvgIrQxleUd5Rkxx5gmdjxV6Cv753InX9LFN4YH2tnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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