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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91cc1ba435f398a62fbe7f9f257077c78a10902961080004c06c656703f46ed7' 
  AND token = 'WLwfx+/kt8rD+agfVStCjaEjXOsAilpKAbsV/0UEB6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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