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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '120f289530ccf5e948b2aae0d638712888bec3d50dcccb5dbac4801bf74e7eb5' 
  AND token = 'l98terctAzdYTdshem7GdGXOZ6Y+xi5NwtPDWLfazWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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