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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8a6977fd6a4db83315690d783f5f7206d73cd9a70756eb134ad40c3467dd522f' 
  AND token = 'IksYDP42/jSDHx28D2GDmr/EyDTpc3MRECja6Enj1fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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