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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea816957bac416ccb42dc9fbb73aa1cf53da0e6d8b596cde849195426cf25f2b' 
  AND token = 'VjFFDiPb90IfbRQ8kwGoWMcF9kRDENqeybOVOe+hKbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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