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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07846f7823b690a8d166d574ed98a4473b9faf0ff476064e9915f118cd377a2e' 
  AND token = 'XqBdj0xorCgDAJ7EFjs7XjxjtC6ekH+DIMntmx2rKKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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