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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '59e7f7f64e13bbde0fdff408a6bac0ed25fc10e18d0238b31435398350dd41c7' 
  AND token = 'CU5+450reGAfNWYqHbP8bpbxmhE2WnLnGhW3SJB5KRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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