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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '55514bb1937bd579bf937d3a7460dbe61be9c654238970df34a4c8a90d4fc8cd' 
  AND token = 'V3xvCBTJCATAgpNVBLDp4g33vMgf5JzHDzE9xYk360g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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