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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5dd563e934d426af2ce3884ff1815da2b665c731981f191d9f1b9bc3c30fa6e9' 
  AND token = '/cM478O/VvUNMvV2kP/o337WUZumdd5vP5Q2K82jGJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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