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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd043867da93d17633d66eea05184e18fda184e7993952dc9ab5ef51375ba754' 
  AND token = 'mZ90NI04Rmt8THKZTvYoD1CoK0NDPC4F+DVDRzlMCOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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